Blackheath No. 4. Top of Blackheath Hill. £50.0.0. The gift of Mrs Trotter. This trough is one of several erected in memory of Robert Trotter. It is also one of a few that contain the inscription "METROPOLITAN DRINKING FOUNTAIN AND CATTLE TROUGH ASSOCIATION" instead of the more usual "METROPOLITAN DRINKING FOUNTAIN & CATTLE TROUGH ASSOCIATION". For a full list of troughs with an "AND rather than a "&" click here.